A scientific instrument that records electrical variations in the Earth's crust or ground, typically used to detect underground geological features or mineral deposits.
From electro- (Greek elektron, 'amber') + tellurograph (from Latin tellus meaning 'earth' + Greek graphia meaning 'recording'). The term emerged in geophysics research.
The electrotellurograph was one of the earliest geophysical tools for looking beneath the Earth's surface without digging—it works by measuring how electrical currents travel through different rock layers, revealing hidden mineral deposits and geological structures.
Complete word intelligence in one call. Free tier — 50 lookups/day.